On Fri, 5 May 2006, William Chops Westfield wrote:

> Does Jtag actually specify details for doing actual programming and
> other high level functions?

Afaik there are several standards for JTAG commands. The command sets 
nest, forming an outer protocol and an inner protocol. The outer 
protocol makes device interfaces compatible (f.ex. you can daisy-chain 
JTAG devices and then address the relevant device from the end of the 
chain). The inner protocols are debugging and testing protocols (what 
JTAG was made for), and more recently programming protocols (which seem 
to be proprietary). One has to read through the standards to discover 
the details.

Peter
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